Brush the sand off the mushrooms with a wet paper towel. Cut mushrooms into thin slivers.Chop the parsley. Add both to a large mixing bowl.
In a small bowl, whisk together the oil, lemon juice & zest until smooth. Season with salt & pepper to taste.
Add the oil mixture and Parmesan cheese (reserving ¼ cup for the top of the salad) to the bowl and toss until all the ingredients are coated. Adjust seasoning. Pour the salad into a salad bowl and top with the remaining Parmesan shavings.
Salad should be made a few hours ahead so mushrooms can pickle and marinade.
Serve at room temperature.
SERVES 4
Mushrooms create liquid so if the salad is a bit watery drain off some liquid and drizzle a little more olive oil before serving.